HOME >> BIOLOGY >> NEWS
Study sheds light on why humans walk on two legs

Studying chimpanzees trained to use treadmills, a team of anthropologists has gathered new evidence suggesting our earliest apelike ancestors started walking on two legs because it required less energy than getting around on all fours.

The research will appear in the July 24 print edition of the Proceedings of the National Academy of Sciences.

"When our earliest ancestors started walking on two legs, they took the first steps toward becoming human," said lead researcher Michael Sockol of UC Davis. "Our findings help answer why."

"This is the first time anyone has succeeded in studying energetics and biomechanics in adult chimps," said Sockol, who worked for two years to find an animal trainer willing to coax adult chimps to walk on two legs and to "knucklewalk" on all fours on the sort of treadmill found in most gyms. The five chimps also wore face masks used to help the researchers measure oxygen consumption.

While the chimps worked out, the scientists collected metabolic, kinematic and kinetic data that allowed them to calculate which method of locomotion used less energy and why. The team gathered the same information for four adult humans walking on a treadmill.

The researchers found that human walking used about 75 percent less energy and burned 75 percent fewer calories than quadrupedal and bipedal walking in chimpanzees. They also found that for some but not all of the chimps, walking on two legs was no more costly than knucklewalking.

"We were prepared to find that all of the chimps used more energy walking on two legs -- but that finding wouldn't have been as interesting," Sockol said. "What we found was much more telling. For three chimps, bipedalism was more expensive, but for the other two chimps, this wasn't the case. One expended about the same energy walking on two legs as on four. The other used less energy walking upright."

These two chimps had different gaits and anatomy than
'"/>

Contact: Claudia Morain
cmmorain@ucdavis.edu
530-752-9841
University of California - Davis
23-Jul-2007


Page: 1 2

Related biology news :

1. Study begins to reveal clues to the cause and progression of sepsis
2. Study finds gender differences in renal and other genes contributing to blood pressure
3. Study suggests estrogen deficiency can lead to obesity-induced high blood pressure after menopause
4. Study: Sticking to the sand might not be such good, clean fun for beachgoers
5. Study points to new way to predict death risk from torn aorta
6. Study identifies new gene therapy tools for inherited blindness
7. Study finds contaminated water reaching Floridas offshore keys
8. Study explains how pathogens evolve to escape detection
9. Study finds hereditary link to premenstrual depression
10. Study identifies energy efficiency as reason for evolution of upright walking
11. Study shows cane sugar, corn sweeteners have similar effects on appetite

Post Your Comments:
*Name:
*Comment:
*Email:


(Date:6/19/2020)... ... ... The director of stem cell biotechnology company Asymmetrex , Dr. James L. Sherley, ... easier access to stem cell counting, they will soon make it a routine part ... in the U.S., Asymmetrex is offering free tissue stem cell counting at its ...
(Date:6/19/2020)... ... ... Join experts from Envigo Lauren Klaskala, Project Manager – Custom ... on Wednesday, July 8, 2020 at 11am EDT (4pm BST/UK). , Nuclease-based technologies such ... while modifying the genome may be more straightforward, the challenge to create an optimal ...
(Date:6/11/2020)... ... June 08, 2020 , ... Cryo-Cell International’s announcement ... to protect workers in the medical field. The face masks will be distributed ... their lives every day to provide healthcare to pregnant women. The delivery of ...
Breaking Biology News(10 mins):
(Date:7/18/2020)... ... 16, 2020 , ... “We are thrilled to deliver this new technology to ... of its kind on the market and we were pleased that the IFT jury ... traditional cultured ingredients, creating a natural way to extend the shelf life and improve ...
(Date:7/10/2020)... ... 08, 2020 , ... Bode Technology, a leading ... operations through its COVID-19 testing service, Bode-CARES . Bode-CARES combines high-volume clinical ... provides a turnkey solution that includes a comprehensive collection and virus-management program ...
(Date:7/10/2020)... Mass. (PRWEB) , ... July 09, 2020 , ... ... approaches to cell therapy, today announced the hiring of Allen R. Nissenson, M.D., ... team and oversee the clinical development of Sentien’s lead product, SBI-101. Dr. ...
(Date:7/1/2020)... ... June 29, 2020 , ... MedShift , ... in 2020, despite many obstacles created as a result of COVID-19. As a ... its partnered medical practices and medical manufacturers by expanding access to device offerings, ...
Breaking Biology Technology:
Cached News: